Clean the mushrooms and gently remove stems, taking care to leave the caps intact. Set caps aside. Finely chop the stems and combine them in a bowl with the bread crumbs, egg, cheese, garlic and seasonings. Add the remaining 2 T. olive oil and stir well to combine. Stuff each mushroom cap with the mixture, then place mushrooms (stuffed side up) on the prepared baking sheet. Place pan on middle rack in oven and bake 15 minutes. Remove from oven. Mushrooms can be served immediately or at room temperature.